Gas-mask



W. KOPS.

GAS MASK.

APPLICATION FILED APR.24, 1919 Patented Nov. 1, 1921.

UNITED STATES PATENT OFFICE] GAS-MASK.

Specification of Letters Patent.

Patented Nov. 1, 1921.

Application filed April 24, 1919. Serial No. 292,267.

To all whom it may concern Be it known that I, WALDEMAR KOPS, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of New York, have invented an Improvement in Gas-Masks, of which the following is a specification.

In the early production of gas masks, the hood or face piece members thereof, were made of flexible material so that in the use of the masks, the same were collapsible, that is to say, the hood or face piece of a mask when in use would be distended each time the wearer exhaled and would be collapsed each time the wearer inhaled. Later and in the further development of gas masks, in order to overcome the objectionable collapsing action of the hood or face pieces thereof, the hood or face pieces were made of relatively stiff material molded over a form' so as not to be collapsible when used. Obvious disadvantages however were found from the manufacturing standpoint in the construction of this type of hood or face piece for gas masks, and in order to overcome this difiiculty and to produce the hood or face member of a gas mask from a flat sheet of fabric, dispensing with the molding operation is the object of this invention. In carrying out the same, I have found it quite possible to construct the hood or face piece of a gas mask from a sheet of relatively stiff fabric by so forming the'blank therein that the desired configuration is obtained by goring the lower end of the blank and suitably connecting the edges of the gore, so that it is only necessary to connect two edges, or make a single seam to form the hood. Furthermore, the gores. made in the lower end of the blank are so'shaped that when the edges thereof are connected, there is provided an opening for the fitting in which the hose or flutter valve or both may be connected.

y present invention will be hereinafter more particularly described in conjunction with the accompanying drawings in which Figure 1 is a perspective view of a gas mask made in accordance with this invention.

Fig. 2 is-a plan of the blank from which the hood of the mask is formed, and

Fig. 3 is a side elevation illustrating the shape of the mask after the edges of the gores have been connected.

Referring particularly to the drawing, the hood or face piece of a gas mask is indicated at 10. This hood or face piece member is made from a single piece of flat fabric such for example as rubberized duckor sail cloth which may or may not be covered with a sheet of flexible fabric such as stockinet. The mask is formed by stamping out "the blank in the form of the blank 11 illustrated in Fig. 2. In this blank, there are provided the eye iece openings 12 together with tabs 13 at t e upper end of the blank for connecting the same to the harness straps and the tabs 14 at the sides of the blank for connecting the same to other harness straps. The bottom or the lower end of the blank is formed in the central portion thereof with a curved gore 15 at the extremities of which there are projections 16 and 17. The lower edge of the blank between the projection 16 and the side of the blank is curved as indicated at 18 and similarly the lower edge of theblank on the opposite side is curved as indicated at 19 from the rojection 17 to the side edge of the bla the curve 19 being of similar con figuration to the curve 18. I

The lower edges of the blank thus formed, from the projections 16, 17 to the side edges of the blank, that is, the curved portions thereof 18 and 19 maybe then zigzagged as indicated at 20 in Fig. 3, and these zigzagged edges of the gored lower portions of the blank suitably connected to one another by cement or stitching or both. In so doing, the-blank is given the shape approximately as indicated in Fig. 3 to form the hood or face piece of the mask. This as will be understood, leaves an opening 21 at the center in the lower end of the hood in which a fitting may be secured for connection to the hose or flutter valve or both these members as commonly employed in 'gas masks. .When thus formed, the joint as will be understood, extends from the lower front central portion of the mask to the throat section thereof and may be suitably taped as indicated at.

22 in Fig. 1, either on the outside or both on the outside and the inside.

In Fig. 1, I have not illustrated the mask as provided with the necessary hose and flutter valve, although as;shown in this figure, the hood is illustrated as being fitted with the eye pieces 23, the top straps 24, the side straps 25 and the lower straps 26, all these straps forming the harness by which the mask is secured in place on the head of the user.

In this type of gas mask, it is necessary to provide some form of chin rest to make the mask fit the face properly and secure the same in position, but the particular form of chin rest employed forms no part of this invention.

I claim as my invention:

1. In a gas mask, a hood made from a unitary blank of flexible material by uniting symmetrically shaped oppositely disposed portions of the lower edge of the blank by a single joint.

2. In a gas mask, a hood constructed from a unitary blank having symmetrically shaped oppositely disposed parts in the lower edge thereof, the said symmetrically shaped oppositely disposed parts of the loweredge of the blank being connected by a single butt joint to completely form the hood and provide therein a recess for the chin of the wearer.

3. In a gas mask, a hood constructed from a unitary blank having symmetrically shaped oppositely disposed parts in the lower edge thereof, the said symmetrically shaped oppositely disposed parts of the lower edge of the blank being connected by a single butt joint to completely form the hood and provide therein a recess for the chin of the wearer, and to also provide therein a central opening in the lower front portion of the hood forward of the said recess for the chin.

Signed by me this 21st day of April, 1919.

WALDE-MAR KOPS. 

